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Definition 2025

ceathrú f ‎(genitive singular ceathrún, nominative plural ceathrúna)

a quarter

ceathrú chun a trí‎ ― a quarter to three

ceathrú tar éis a trí‎ ― a quarter past three
thigh

Declension of ceathrú

Fifth declension

Bare forms

Case	Singular	Plural
Nominative	ceathrú	ceathrúna
Vocative	a cheathrú	a cheathrúna
Genitive	ceathrún	ceathrúna
Dative	ceathrú ceathrúin (in certain phrases)	ceathrúna

Case	Singular	Plural
Nominative	an cheathrú	na ceathrúna
Genitive	na ceathrún	na gceathrúna
Dative	leis an gceathrú don cheathrú	leis na ceathrúna

ceathrú ‎(triggers h-prothesis of a following vowel)

Irish mutation
Radical	Lenition	Eclipsis
ceathrú	cheathrú	gceathrú
Note: Some of these forms may be hypothetical. Not every possible mutated form of every word actually occurs.